I believe pipewire just has support for more modern bluetooth codecs.
To be clear, these were bluetooth headphones which would sometimes work with pulseaudio but it was a coinflip whether they would work properly or jerk me around for an hour. On paper it all should have worked, but pulseaudio just isn't reliable.
Basically what I'm saying is that pulseaudio has serious issues even with new "fixed" drivers and distros switching to Pipewire is making the situation much better for many users.